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How does Drop frame duration calculates in spirent? 

Spirent Test Center GUI

It depends on the the frame size , Stream rate and drop count filed in Advance sequencer tab.

This is how that drop count calculates for 128 byte frame (148 Bytes since there are 20 Bytes of preamble/SFD):

  • Drop Count * 148 Bytes * 8 bits = Number of  bits lost
  • Number of bits lost / stream rate = Drop Duration

Product : Windows GUI